jb90

Follow someone like Dave Swift on Instagram. He posts details of his studio sessions most days, that'll give you an idea of what to expect. With regard to playing, they need you to nail the part as quickly as possible, maybe a couple of runs through first. You'll either be given chords written out, or maybe a part actually notated.

@jb90 My own basses are Fenders, and my passive P with old flatwounds sounds very good DI'd, and sites nicely in the mix for a lot more styles than you'd expect. I like Stingrays too - I don't think turning up with a Stingray is going to lose you work! Just make sure you are versatile in how you can play it, that's the main thing. You can cover most styles with a P, J, Stingray or variations on those themes. In fact, I'd probably be happy with a switchable active/passive PJ bass as my only bass!

But perhaps old flatwounds are a good option to bring as well - as I said they can be far more versatile than one thinks.

If its a good studio, chances are there will be some decent bass guitar options there as well - don't be offended if they prefer the sound of one of studio basses to your own, just enjoy the experience.

Have a look at Dishan Abrahams, and the video he did with That Pedal Show. Super interesting video, gives a general insight into some of this stuff and the gear he uses and how he gets around certain situations (such as synth/keyboard sounds, he sometimes uses a Moog Lil Phatty but often pedals)